body {
    /* background: #f2f2f2; */
    background: #282c34;
}

.frame {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 400px;
    height: 400px;
    margin-top: -200px;
    margin-left: -200px;
    border-radius: 2px;
    box-shadow: 1px 2px 10px 0px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    background: #102020;
    color: #fff;
    font-family: 'Open Sans', Helvetica, sans-serif;
}

.center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.atom {
    position: relative;
    box-sizing: border-box;
    width: 160px;
    height: 160px;
    border-radius: 50%;
    border-width: 8px 8px 0 0;
    border-style: solid;
    border-color: transparent;
    border-top-color: var(--color, #0f0);
    animation: rotate 3s linear infinite;

    &:before {
        position: absolute;
        content: '';
        width: 32px;
        height: 32px;
        border-radius: 50%;
        background: var(--color, #0f0);
        right: 0;
        top: 4px;
        box-shadow: 0 0 32px 4px var(--color, #0f0);
    }
}

.gold {
    --color: gold;
    top: 80px;
}
.cyan {
    --color: cyan;
    top: -80px;
    animation-delay: -1.5s;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}
